A method for upgrading solid waste, especially household garbage, comprising at least 30 % cellulose matter. The method includes the preliminary steps of crushing and sorting the waste to remove metal elements. The method involves heat treating, in a tubular reaction vessel (13) provided with an Archimedean screw and heated by hot flue gases injected through its inlet, said reaction vessel containing a partial vacuum, mineral products and a mixture of a homogeneous mass containing the shredded waste. The mixture particularly contains quick lime, calcium carbonate and caustic soda. In the first part of the reaction vessel, the heat treatment and the addition of said minerals cause a rise in the temperature of the mixture and lead to the production of intense luminous radiation. A device for implementing the method is also disclosed.
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